Plumb bob



ug. i4, w28.

K F. M. LEWIS PLUMB BOB .l Original Filed Jan. Fiyi i F Patented Aug. 14, 1928*.

Unirse stares @FFE Q E.

VLZEW'IS, :OF PASCALGOU'LA, MISSISSIPPI.

.Application filed January 13, 19,27., Serial No. 160,861. Renewed June 25. 1928.

My inventionrelates to plumb bobs, .and has 'for yone object to provide a plumb bob adapted to be used in .connection with a .metallic ,tape in measuring l.the depth of liquid in tanks, sounding in hydrographie surveys, cross sectionin g streams, and ,the like.

Another .object is to provide such .a device y that will be-compaet, yadaptable to ,any shape` quickly and easily adjusted .to ,and removed frein the tape, accurate, with no springs :to

wear out vand .no springs tio adjust,` and adapted to have' fthe bottom thereof positioned flush with the end yof .the tape.

lfVith .the .above and other l.objects in view,v

my invention consists in the combination and .arrangement of parts hereinafter described and claimed', and more particularly illustrated by the embodiment shown in the accompanying drawings, in which Figure 1 is a perspective elevation of my invention in connection with a metallic tape; Figure 2 is a sectional view through my invention along the line 2 2 of Figure 7 Figure 3 is an interior elevation of one of the halvesof the invention, the other half being substantially similar;

Figure 11 is an elevation of one of the inserts;

Figure 5 is a sectional view similar to Figure 2 showing the inserts in use therein;

Figure 6 is a bottom plan view of the invention;

Figure tion. 1

In the embodiment shown in the drawings, the invention is vdesigned for use with a fifty foot metallic tape of any standard make; however, an insert is provided whereby the device may be used with any tape. Upon examination of any standard fifty foot metallic tape, it will be found that the ring is attached to the tapeend by a metal clevis' approximately five-sixteenths of an inch in diameter. It is this clevis that is dependent upon to lock the tape in the plumb bob as will hereinafter be described. My invention as described may be constructed of cast iron or brass, and in various weights and sizes.

Referring now more particularly to the drawings, I provide a body A having the lshape of a frustrum of a cone split along its longitudinal-center line into two equal portions as at 1 and 2. The portion 1 has fastened thereto the spring clips 8 adapted to engage the depressions 4 provided in the portion 2. rIwo small dowel pins 5 are posiis a top plan view of my inventioned in the portion 1 and adapted to en-l gage the holes v6 provided in the portion 2, whereby the said portions 1 and 2 are adapt- .ed to exactly register with one another and held together by ,means of the spring clips 3 said recesses extending longitudinally the plumb bob. A transversely extending semi- ,circular recess 8 is provided in each portion and communicates with the longitudinal recesses 7. The ,said semi-circular recesses 8 are so positioned inthe yplumb bob with rcspect .to the bottom thereof :thatthe clevis 9 of a Vmetallic tape 10 will fit into the said recesses 8 and the end bai' 11 of the ring 12 will come flush with the bottom 13 of the plumb bob A. The said bottom 13 of each portion 1 and 2 of the plumb bob A. is provided with the recess 14, so that the plumb bob when resting upon a fiat surface (not shown) will rest only upon the outside perimeter 15 and a small portion,as at 16, at the center around the slot 17 formed by the corresponding recesses 7 when the two portions of the plumb bob are fastened together.

Referring to Figures L1 and 5, an insert is shown for use when other than a standard metallic tape is used. rIwo similar pieces of metal or inserts 18 are provided adapted to fit into the corresponding recesses 7; the said inserts 18 have formed on one side the ribs 19 adapted to engage the semicircular recesses 8; on the other side of the inserts is provided a recessed channel 2O provided with the transverse groove 21. The inserts are fastened to the two portions of the plumb bob by means of screws as at 22 so that the channels 2O and transverse grooves 21 of the two inserts register with one another whereby a tape 23 may be positioned in the said channels and the end 2&1 of the tape positioned in the grooves 21.

I claim:

1. In a plumb bob adapted for use with a metallic tape, a body formed in the shape of a frustrum of a cone split along its longitudinal center line into two portions; each of said portions having corresponding recesses adapted to receive said tape; and means for fastening the portions together.

2. In a plumb bob adapted for use with a metallic tape provided wit-h a metal clevis; a body formed in the shape of a frustruni of a cone split along its longitudinal center line into t-Wo portions; each of said portions having corresponding recesses adapted to receive said tape and also having transverse semicircular recesses communicating With said longitudinal recesses and adapted to receive said clevis; and means for fastening the portions together.

3. In a plumb bob adapted foruseivith a metallic tape-7 a. body formed in the shape of a frustruin of a cone split along its longitudinalcenter line into tivo portions; each of said portions having corresponding recesses adapted to rece-ive said tape; means for Yfastening the portions together; the bottom of said portions having arcuate recesses Where.-

by the plumb bob is adapted to rest only up on its perimeter and its central part.

t. In a pluinb'bob adapted for use with a Y metallic tape provided with a metal clevis; a `body formed in the shape of a frustruin of a 'cone split along its longitudinal center' line into two portions; each of said portions having corresponding recesses adapted to receive said tape and also having transverse semicii- `cular recesses communicating with said longitudinalrecesses and adapted to receive said clevis; means for .fastening-saidpo-rtions to-V gether; the bottoni 'of said portions having arcuate recesses whereby tli-eplumbl bob is adapted to rest only upon its perimeter and its central part. Y

5. In a plumb bob adapted for use With aY tape, a Vbody formed in the shapezof a frusf truni yof` a cone split Valong its longitudinal centerline into two portions; each of said portions; having corresponding longitudinal recesses and also having transverse semicircular recesses communicating with said longitudinal recesses; a. pair of corresponding inserts adapted to engage said longitudinal recesses; semicircular ribs Vpositioned on the Vouter faces of said inserts adapted to engage said transverse a recesses in the plumb bob; tlie'inner faces of said insertsbeing adapted to engage said tape; and means for fastening said portions together so asto Yenclose said inserts thereinbetween. Y

v `In testimony vwhereof I aiiixiny sigi'iature.v

l FLOYD M LEWIS. 

